4results about How to "Suppress overvoltage" patented technology

The application discloses a full-automatic variable-distance flexible grabbing system and a control method thereof, converts mechanical adjustment of X-axis, Z-axis and Y-axis into electrical parameter adjustment, and provides two control methods which are special for a clamping module of the full-automatic system and are used for servo drivers of the clamping module, namely, a software multi-circle backup is used to replace an internal battery of an encoder, and cross-rolling verification is combined, so that the servo driver of the clamping module can directly enter a clamping ready state without returning to an original point mechanically after being powered on; and a weak magnetic control algorithm is used to suppress reverse electromotive force from a source, replace passive protection devices on a sensor signal line, and guarantee that multi-sensor AND fusion determination logic is continuously reliable in a full-speed section. The application eliminates two delay sources of initialization waiting and sensor failure, and realizes a complete closed loop from structure to control, and releases a formula to zero-second transformation.

The application discloses a photovoltaic grid-connected system and an alternating current fault ride-through method and device thereof, and comprises a plurality of photovoltaic arrays, a plurality of photovoltaic grid-connected inverters, a direct current collection line and a step-up transformer. Each photovoltaic grid-connected inverter is composed of six bridge arms, wherein each bridge arm comprises a plurality of photovoltaic sub-modules; each photovoltaic sub-module comprises a front-stage MMC converter sub-module and a rear-stage DC-DC converter. When an alternating current fault occurs in the photovoltaic grid-connected system, a hierarchical three-stage control of a photovoltaic converter stage, a bridge arm stage and a sub-module stage is combined to independently regulate the output of each photovoltaic sub-module, ensure that photovoltaic MPPT control is not completely disabled during the fault ride-through, inhibit overvoltage of the photovoltaic sub-module when the grid voltage drops, and realize the alternating current fault ride-through of the photovoltaic grid-connected system.

A kind of combined grid-friendly photovoltaic confluence system for 5G base station, including confluence unit, sensing unit, photovoltaic power generation system is accessed to direct current bus through confluence unit;Sensing unit collects distribution network voltage information and is transmitted to confluence unit in real time;Confluence unit according to distribution network voltage and direct current bus voltage, dynamically adjusts output power.Confluence unit includes: main power circuit, auxiliary power supply circuit, sampling circuit, drive circuit, control module, protection circuit, first wireless communication module.Sensing unit includes: single-chip microcomputer, wireless communication module, ac power grid power quality monitoring unit, auxiliary power supply.The utility model discloses a kind of combined grid-friendly photovoltaic confluence system for 5G base station, to be able to cope with 5G base station inside direct current bus overvoltage problem, simultaneously can according to the distribution network voltage of surrounding node, dynamically adjust power output, improve the stability of power supply system.

The application discloses a kind of coordinated control method and system for inhibiting power grid overvoltage, according to grid voltage and phase modifier steady-state displacement, construct the control strategy of reactive power source for inhibiting power grid overvoltage, in the control strategy of reactive power source, consider the voltage counter-regulation caused by the action delay of SVC, only after DC commutation failure according to grid voltage trajectory Trigger SVC coordinated control, in the case of power grid overvoltage, add phase modifier to DC reactive power compensation system, make it with original converter station filter, DC reactive power compensation capacitor coordinated as the operation of new DC reactive power compensation system, according to grid voltage situation Control phase modifier and SVC, realized that multiple types of reactive power source inhibit power grid whole process overvoltage, improve the voltage comprehensive control level of high proportion new energy DC external sending system.